12/r11-r7

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Solution for 12/r11-r7 equation: 


D( r )

r^11 = 0

r^11 = 0

r^11 = 0

1*r^11 = 0 // : 1

r^11 = 0

r = 0

r in (-oo:0) U (0:+oo)

12/(r^11)-r^7 = 0

12*r^-11-r^7 = 0

r^7*(12*r^-18-1) = 0

12*r^-18 = 1 // : 12

r^-18 = 1/12

-18 < 0

1/(r^18) = 1/12 // * r^18

1 = 1/12*r^18 // : 1/12

12 = r^18

r^18 = 12 // ^ 1/18

abs(r) = 12^(1/18)

r = 12^(1/18) or r = -12^(1/18)

r^7 = 0

1*r^7 = 0 // : 1

r^7 = 0

r = 0

r in { 0} 

r in { 12^(1/18), -12^(1/18) }

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